只有3个约数的数有______．（举例3个）

根据中国科学院国情分析研究小组估测：我国人口承载量最高控制在16亿左右，最适合的人口数量为7亿左右。下列关于环境人口容量的说法，正确的是（）

A．环境人口容量是时间的函数，具有确定性　

B．一定历史阶段一定范围内的环境人口容量有相对的确定性　

C．文化和消费水平的变化不影响环境人口容量　

D．地区的对外开放程度对环境人口容量没有影响

没有侧线的分馏塔物料平衡公式为（）。（F-进料量，W-塔底产品量，D-塔顶产品量）

A、W=F+D

B、D=F+W

C、F=W+D

D、2F=W+D

阅读理解

     During my high school years, the most important thing was what I was wearing to the Friday night

dance and who I was taking. Although college was talked about, it was the least of my worries.

     When I was graduating eighth grade and starting high school, my older brother was graduating

twelfth grade and going onto college. For my graduation, he gave me a card in which he wrote, "Enjoy

your four years. . . They go by fast." I remember not believing him then, but looking back. . . He was

right. Those four years shaped who I was as a person, pushed me to my limit and encouraged me to

become an adult.

     However, I was so completely absorbed in my junior and senior years of high school, that when

someone spoke of college I brushed it off. I wasn't ready to leave my comfort zone of having all of my

closest friends together and knowing what every single day was going to be like. Studying was something

I did only AFTER I nailed my halftime dance performance. I knew my parents wanted me to go to

college, so I told them I would go to community college (社区学院) and I didn't worry about my SAT

(美国大学入学考试) scores.

     When my senior year passed and everyone graduated and went off to their own colleges, I started to

wish I had done the same. My friends were living away, meeting new people, and discovering new

places, while I was living at home and driving to and from class every day. It seemed exactly like high

school. I hated it!I thought college was supposed to be different!Why didn't I take more time to

research colleges and do the same?I ended up loving college and wishing I had four years to enjoy the

campus (大学校园) atmosphere instead of two.

     My advice to anyone thinking about attending college is to think about it very seriously and look into

all of your choices well ahead of time. Now I have graduated and I am working fulltime and I would do

anything to go back to my high school days for a second chance!

1. Why didn't the author worry about his SAT scores?

A. He wanted to go to community college.

B. He had been admitted for his gift in dance.

C. He was well prepared for the exam.

D. He believed his brother would help him.

2. When in high school, the author________.

A. drove to and from class every day

B. buried himself in his study all the time

C. enjoyed talking about future college life

D. lived in the school except on holidays

3. What did the author's brother mean by "Enjoy your four years. . . They go by fast."?

A. He wished the author to have more dance.

B. He advised the author to value the years.

C. He encouraged the author to leave his comfort zone.

D. He suggested the author aim at a community college.

4. Talking of his high school years, the author feels________.

A. regretful  

B. lonely

C. angry

D. pleased

马凡综合症的主要声像图改变是（）。

A.主动脉根部瘤样扩张

B.主动脉窦瘤扩张

C.主动脉瓣狭窄

D.升主动脉内经变窄

E.主动脉内径正常

中国篮球协会试行全国性的职业篮球联赛是在（）。

A、1995年CNBA联赛；

B、1996年CBA职业联赛；

C、1995年全国甲A联赛